Improvement in lock-ntjt



tatrnt deities,

EDWIN R. SHEPARD, OF SGRAN'ION, PENNSYLVANIA.

Lettersl Patent No. 102,600, dated May 3, 1870.

IMPROVEMET IN LOCK-NUT.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom tt may concer/L Be it known that I, EDWIN It. SHEPARD, of Scranton, Luzerne county, Pennsylvania, have invented certain new and useful Improvements in Oompensating Lock-Nuts, of which the following isa f'ull` clear, and exact description,.reference being had to the accompanying drawing, in which- Figure l is a plan view ot' the nut, as applied;

K Figure 2 is a sectional view through the line :r y, tlg. l and Figure 3 is a modification in the form of the washer, used in the other figures.

Similar letters ot' reference indicate corresponding parts in all the gures.

The invention. relates to that class of lock-nuts in which the nut is prevented from backing oii, by means of a rib upon the washer engaging with a corresponding groove in t-he inner face ofthe nut, or rice versa, and consist in tirst combining a supplemental Washer with the elasticlocking-washer heretofore used, for a purpose hereinafter explained.

Second, in locking the nut by means ot' a washer which is itself held from turning by the bolt passing through said washer andnut. l

Third, in making the Imetallic locking-washer with an elongated slot extending nearly from end to end, for the purpose of' relieving the tendency to break in the center when the nut is screwed down tightly.

In the drawing- A represents a bolt of' the ordinary construction, except that it is flattened upon one side, as shown at a, fig. l, and is adapted to be held from turning by the material through which it passes.

B is the nut, provided upon its inner or lower tace with a radial groove or grooves, c.

C is a metallic locking-washer, in which the slot c extends nearly its entire length, making virtually two parallel springs of equal or n'early equal strength throughout, and tied together at their ends.

This spring is provided with a rib7 c', across its upper face, and adapted to engage with the groove b in nut B.

D is a washer, made arching or concave to give it the desired elasticity.

The .perforation d is made flat at one side to correspond with the shape of the bolt B, and thus hold the washer from turning around.

lhis washer is also furnished with a rib, d', for the purpose of locking a bolt upon it.

E is a supplemental washer, which may be either elastic or non-elastic, as required.'` The operation of my devices is as follows:

As the nut B is screwed down so. as to hug the spring washer C or D, lthe rib c l,or d snaps into the groove l), and eftectually prevents nutB from backing oitl from the4 jarring of parts.

The height ot' rib c or (Z need not exceed one-quarter the distance between the threads of' the vbolt or f nut, in which case the nut can be screwed down until it finds a positive solid bearing, with the washer lying flat between the nut and the part to which it is applied, because when the forward edge of the groove b reaches the highest point on the rib, it cau bc turned far enough beyond this point to bring the rib ful1yin to the groove without shortening the distancebetween the head of the bolt and the nut, and yet the nut is held from returning or backing by the elasticity of' the washer.

By using the supplemental washer E, I am enabled to use a lighter locking-washer than I could otherwise do, from the fact that the inner washer sustains nearly all of the strain, the outer one doing little else than to take up the slack in case parts become loosened.

It is difticultfinany times, to secure the washer up-l on the part to which itis applied in such manner that the nut'may be properly locked, but, by the use of washer D, in combination with the bolt B having a fiat side, theydifoulty is entirely obviated, the nut and bolt being free tov turn, out their relation to each other being always the same, or, if desired, the washers O may be held from turning by making the slot c so narrow as-to bear against the tlat side of the bolt.

Having thus described iny invention,

lVhat I claim as new, and desire to secure by Letters Patent, is-

l. The combination of the bolt A, nut B, and washers O E or washer D, constructed and operating substantially as set forth.

' 2. The elastic elliptic washer G, provided with an elongated slot, substantially as described.

EDWIN It. SHldlPAIEtD.

Witnesses:

' JOHN WHITE,

H. H. DOUBLEDAY. 

